Its main chemical component is ZrO2, and it is usually made of monoclinic zirconium or partially magnesium-stabilized zirconium to form refractory materials. It has an extremely high melting point. Its bulk density is generally above 5.0 g/cm3, its maximum service temperature is 1900℃, it has low thermal conductivity, and it also has excellent chemical stability, which can withstand the corrosion of alkaline melts, acidic slags and highly reactive metals (such as platinum, palladium, and rhodium) for a long time.